Yes, that's exactly Guilherme's point: /boot is on rootfs, and we have
separate rootfs and bootfs; bootfs is typically the first partition and
a vfat which holds MLO, u-boot.bin, uImage, uInitrd and boot.scr.
rootfs is extN or btrfs and contains /boot/vmlinuz, /boot/initrd.  The
bug asks for /boot/boot.txt, but it might or might not make more sense
to use a boot.txt file on the bootfs rather than a /boot/boot.txt file
on the rootfs.

BTW my preference is to have u-boot read a text file script rather than
this weird boot.scr format; a patch was sent upstream 10 days ago to
implement this.  We need to be careful to not overwrite a custom
boot.txt with an automatically generated one though; think of the
update-grub mechanism for instance.  There's some non-trivial amount of
work to support it in the rootfs (flash-kernel etc.).  I'm not sure this
is a linaro-image-tools thing though; eventually, we'd just call this
mechanism from linaro-image-tools rather than generating a boot.scr, but
currently we mimic what flash-kernel is doing, and that's where we ought
to fix this IMHO.

** Also affects: flash-kernel (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/712703

Title:
  please install clear text version of boot.scr to /boot/boot.script on
  rootfs

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